feat(election): add guarantor status section to nomination-apply page

Shows whether the selected nominee is a guarantor on any loan, with loan health indicator, borrower details, savings account, guaranteed/released/remaining amounts, and loan timeline.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/loans/loans.service.ts

@@ -800,4 +800,8 @@ export class LoansService {
     const httpParams = new HttpParams().set('offset', offset.toString()).set('limit', limit.toString());
     return this.http.get('/entityDatatableChecks', { params: httpParams });
   }
+
+  getLoanGuarantors(loanId: string): Observable<any> {
+    return this.http.get(`/loans/${loanId}/guarantors`);
+  }
 }